Table 5. Association between screening and cervical cancer incidence and mortality.

Age group (years)	Screening history	Direct OR for incidencea	Indirect RR for incidenceb	Indirect RR for mortality
25.5–34	Regularly screened	0.63 (0.56–0.70)	0.61 (0.54–0.68)	0.27 (0.21–0.34)
	Irregularly screened	0.77 (0.68–0.87)	0.76 (0.67–0.86)	0.37 (0.29–0.46)
	Never screened	1.00	1.00	1.00
35–64	<5.5 yearly	0.18 (0.16–0.20)	0.18 (0.16–0.19)	0.08 (0.07–0.09)
	5.5–7.5 yearly	0.29 (0.26–0.33)	0.28 (0.25–0.32)	0.14 (0.12–0.17)
	7.5–13 yearly	0.51 (0.46–0.57)	0.49 (0.41–0.60)	0.28 (0.23–0.33)
	Not screened or >13 yearly	1.00	1.00	1.00
65–79	<5.5 yearly	0.28 (0.24–0.34)	0.26 (0.22–0.32)	0.24 (0.20–0.30)
	5.5–7.5 yearly	0.31 (0.24–0.42)	0.31 (0.23–0.42)	0.28 (0.19–0.39)
	7.5–13 yearly	0.57 (0.44–0.74)	0.57 (0.43–0.75)	0.60 (0.46–0.77)
	Not screened or >13 yearly	1.00	1.00	1.00

^aWithout reference to stage.

^bCombining stage-specific estimates.